Well, it's interesting. Quickly tried now QT pro 7.7.1 for Win with a few configuration parameters, and I also couldn't get identical result between QT pro and qaac. Same for CVBR.On the other hand, I could confirm iTunes plus is still bit-identical with qaac --cvbr 256 -q2, and iTunes custom (CVBR) is identical with qaac --cvbr -q1;

qaac is now built directly upon CoreAudioToolbox, and is not using QuickTime API.QT pro might be doing something different... I don't know for sure.

Hey, thanks for your response, I think I will just convert to alac and downsample using coreaudio now.One question though, on http://src.infinitewave.ca/ which core audio is present in the windows version?I see leopord and tiger, but I believe those are the mac versions.

I think I will just convert to alac and downsample using coreaudio now.

My personal recommendation is just to use SoX. It's good enough and still very efficient (fast). You can run sox resampler from foobar2000 DSP, too.I implemented --native-resampler on qaac to tweek around with CoreAudio SRC not because I want/recommend people to use it seriously.

Apparently CoreAudio has been updated after Leopard release. Leopard is two generation behind from the newest (Lion). However, I don't know if SRC has been updated. I'm not a Mac user anyway.I just quickly tested with sweep wave conversion; From what I can see, --bats,127 gives me something looks similar with Leopard version on the site. However, I don't know if it is exactly the same.

I think I will just convert to alac and downsample using coreaudio now.

My personal recommendation is just to use SoX. It's good enough and still very efficient (fast). You can run sox resampler from foobar2000 DSP, too.I implemented --native-resampler on qaac to tweek around with CoreAudio SRC not because I want/recommend people to use it seriously.

Apparently CoreAudio has been updated after Leopard release. Leopard is two generation behind from the newest (Lion). However, I don't know if SRC has been updated. I'm not a Mac user anyway.I just quickly tested with sweep wave conversion; From what I can see, --bats,127 gives me something looks similar with Leopard version on the site. However, I don't know if it is exactly the same.

Do you think it would be worth re-encoding all my needledrops to sox then and delete all the quicktime downsampled ones?What I find puzzling is the fact that you say leopard two generations behind lion, but lion performs notably worse on the src scales in just about every fashion than leopard.

Also, I have uploaded samples of izotope 64 mbit dithered, original wav, and quicktime and sox comparisons now, so an actual listening test for the public can commence

What I find puzzling is the fact that you say leopard two generations behind lion, but lion performs notably worse on the src scales in just about every fashion than leopard.

How did you know that? Maybe another source?

Care to explain what you mean with aac encoding? This is not to sound like a jack a, i just want to know as much as possible about all of this, and music.

on the src website, i compared the two, namely on passband, transition, tiger falls off from the ideal filter for both, while leopord maintains near accuracy.On sweep, it has all this extra stuff that leopard doesn't have *and izotope 64 doesn't either, so I assume it to not be good*

Why is not worth deleting and resampling everything if I convert to aac, thats what i was asking

Okay, I was assuming that you won't be able to ABX them, so I said no. If you are encoding with perceptual coder like AAC and you cannot tell the audible difference, the difference is not important.Of course it's a different story if you can.

Why is not worth deleting and resampling everything if I convert to aac, thats what i was asking

Okay, I was assuming that you won't be able to ABX them, so I said no. If you are encoding with perceptual coder like AAC and you cannot tell the audible difference, the difference is not important.Of course it's a different story if you can.

From the samples I've provided could you abx it?I'd just like someone whose more knowledgeable and smarter on this with better ears to scale the differences between them.